Employee Benefit Plans (Net Periodic Benefit Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 29	$ 31	$ 86		$ 100
Interest cost	73	69	218		202
Expected return on plan assets	(126)	(116)	(376)		(345)
Amortization of prior service cost (credit)	0	0	2		2
Amortization of net actuarial loss	28	37	84		127
Settlements and curtailments	1	0	1	[1]	(2)	[1]
Net periodic benefit cost (credit)	5	21	15		84
Pension Benefits | Dominion Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Service cost	3	3	9		10
Interest cost	7	7	21		20
Expected return on plan assets	(29)	(27)	(86)		(79)
Amortization of prior service cost (credit)	1	1	1		1
Amortization of net actuarial loss	5	6	14		20
Net periodic benefit cost (credit)	(13)	(10)	(41)		(28)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	10	23		34
Interest cost	17	19	50		56
Expected return on plan assets	(28)	(24)	(83)		(68)
Amortization of prior service cost (credit)	(7)	(3)	(21)		(9)
Amortization of net actuarial loss	1	2	2		6
Settlements and curtailments	0	0	0	[1]	(15)	[1]
Net periodic benefit cost (credit)	(10)	4	(29)		4
Other Postretirement Benefits | Dominion Gas Holdings, LLC
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	1	4		5
Interest cost	4	3	10		9
Expected return on plan assets	(6)	(4)	(17)		(13)
Amortization of prior service cost (credit)	0	(1)	(1)		(3)
Amortization of net actuarial loss	0	0	0		1
Net periodic benefit cost (credit)	$ (1)	$ (1)	$ (4)		$ (1)

[1] 2013 amounts relate primarily to the decommissioning of Kewaunee.